Plumbing issues? When I had one of those at my last place, it just had an attachment for the tap to get the water and another hose that drained into the sink. My current under the counter dishwasher is the exact same setup, it just taps into the inlet and drain under the sink instead of over it. The only physical change to the pluming was replacing the tap nozzle, which I put back without issue when I moved out (might have even given them a new screen when I did so).